Appl Opt. 2022 Oct 10;61(29):8813-8818. doi: 10.1364/AO.469433.
The lobster eye telescope is promising for large-field x ray imaging in astronomy. The special structure of the lobster eye system makes the focal plane a sphere, resulting in detector defocus when the field is large. In this study, we established a model based on the principle of lobster eye imaging and simulated the imaging at different image distances. The results reveal the relationship between the defocus and position accuracy and angular resolution. To ensure the optical performance of the large field lobster eye telescope, we propose a detection system design method using multiple detectors stitched together to form a spherical-like surface and apply it to the development of the Einstein Probe/wide-field x ray telescope (EP/WXT) submodule. About 70% of the detection area is out of focus within 0.5 mm. The scanning image of the integrated WXT submodule shows good uniformity of the point spread function (PSF) for various incident angles, and the effect of defocus on imaging is acceptable.
龙虾眼望远镜有望在天文学中大视场 X 射线成像。龙虾眼系统的特殊结构使焦平面成为一个球体，导致视场较大时探测器失焦。本研究基于龙虾眼成像原理建立模型，模拟不同像距下的成像，揭示了离焦量与位置精度和角分辨率的关系。为保证大视场龙虾眼望远镜的光学性能，提出了一种采用多个探测器拼接成球面的检测系统设计方法，并应用于爱因斯坦探针/宽视场 X 射线望远镜（EP/WXT）子模块的研制。在 0.5mm 内，约 70%的探测面积失焦。集成的 WXT 子模块的扫描图像显示出不同入射角下的点扩散函数（PSF）具有良好的均匀性，离焦对成像的影响可以接受。
